chirp_stream_files - move data to/from chirp servers in parallel


chirp_stream_files [options] <copy|split|join> <localfile> { <hostname[:port]> <remotefile>


chirp_stream_files is a tool for moving data from one machine to and from many machines, with the option to split or join the file along the way. It is useful for constructing scatter-gather types of applications on top of Chirp.

chirp_stream_files copy duplicates a single file to multiple hosts. The <localfile> argument names a file on the local filesystem. The command will then open a connection to the following list of hosts, and stream the file to all simultaneously.

chirp_stream_files split divides an ASCII file up among multiple hosts. The first line of <localfile> is sent to the first host, the second line to the second, and so on, round-robin.

chirp_stream_files join collects multiple remote files into one. The argument <localfile> is opened for writing, and the remote files for reading. The remote files are read line-by-line and assembled round-robin into the local file.

In all cases, files are accessed in a streaming manner, making this particularly efficient for processing large files. A local file name of - indicates standard input or standard output, so that the command can be used in a pipeline.


  • -a,--auth=<flag>
    Require this authentication mode.
  • -b,--block-size=<size>
    Set transfer buffer size. (default is 1048576 bytes)
  • -d,--debug=<flag>
    Enable debugging for this subsystem.
  • -i,--tickes=<files>
    Comma-delimited list of tickets to use for authentication.
  • -t,--timeout=<time>
    Timeout for failure. (default is 3600s)
  • -v,--version
    Show program version.
  • -h,--help
    Show help text.


List any environment variables used or set in this section.


On success, returns zero. On failure, returns non-zero.


To copy the file mydata to three locations:

% chirp_stream_files copy mydata /mydata

To split the file mydata into subsets at three locations:

% chirp_stream_files split mydata /part1

To join three remote files back into one called newdata:

% chirp_stream_files join newdata /part1

The Cooperative Computing Tools are Copyright (C) 2022 The University of Notre Dame. This software is distributed under the GNU General Public License. See the file COPYING for details.